Vulnerabilities > CVE-2010-0562 - Buffer Errors vulnerability in Fetchmail 6.3.11/6.3.12/6.3.13

047910
CVSS 6.8 - MEDIUM
Attack vector
NETWORK
Attack complexity
MEDIUM
Privileges required
NONE
Confidentiality impact
PARTIAL
Integrity impact
PARTIAL
Availability impact
PARTIAL
network
fetchmail
CWE-119
nessus

Summary

The sdump function in sdump.c in fetchmail 6.3.11, 6.3.12, and 6.3.13, when running in verbose mode on platforms for which char is signed, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an SSL X.509 certificate containing non-printable characters with the high bit set, which triggers a heap-based buffer overflow during escaping.

Vulnerable Configurations

Part Description Count
Application
Fetchmail
3

Common Attack Pattern Enumeration and Classification (CAPEC)

  • Buffer Overflow via Environment Variables
    This attack pattern involves causing a buffer overflow through manipulation of environment variables. Once the attacker finds that they can modify an environment variable, they may try to overflow associated buffers. This attack leverages implicit trust often placed in environment variables.
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • Client-side Injection-induced Buffer Overflow
    This type of attack exploits a buffer overflow vulnerability in targeted client software through injection of malicious content from a custom-built hostile service.
  • Filter Failure through Buffer Overflow
    In this attack, the idea is to cause an active filter to fail by causing an oversized transaction. An attacker may try to feed overly long input strings to the program in an attempt to overwhelm the filter (by causing a buffer overflow) and hoping that the filter does not fail securely (i.e. the user input is let into the system unfiltered).
  • MIME Conversion
    An attacker exploits a weakness in the MIME conversion routine to cause a buffer overflow and gain control over the mail server machine. The MIME system is designed to allow various different information formats to be interpreted and sent via e-mail. Attack points exist when data are converted to MIME compatible format and back.

Nessus

  • NASL familyMandriva Local Security Checks
    NASL idMANDRIVA_MDVSA-2010-037.NASL
    descriptionA vulnerability have been discovered and corrected in fetchmail : The sdump function in sdump.c in fetchmail 6.3.11, 6.3.12, and 6.3.13, when running in verbose mode on platforms for which char is signed, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via an SSL X.509 certificate containing non-printable characters with the high bit set, which triggers a heap-based buffer overflow during escaping (CVE-2010-0562). This update provides fetchmail 6.3.14, which is not vulnerable to this issue.
    last seen2020-06-01
    modified2020-06-02
    plugin id48173
    published2010-07-30
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/48173
    titleMandriva Linux Security Advisory : fetchmail (MDVSA-2010:037)
    code
    #%NASL_MIN_LEVEL 80502
    
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Mandriva Linux Security Advisory MDVSA-2010:037. 
    # The text itself is copyright (C) Mandriva S.A.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(48173);
      script_version("1.11");
      script_cvs_date("Date: 2019/08/02 13:32:53");
    
      script_cve_id("CVE-2010-0562");
      script_bugtraq_id(38088);
      script_xref(name:"MDVSA", value:"2010:037");
    
      script_name(english:"Mandriva Linux Security Advisory : fetchmail (MDVSA-2010:037)");
      script_summary(english:"Checks rpm output for the updated packages");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:
    "The remote Mandriva Linux host is missing one or more security
    updates."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "A vulnerability have been discovered and corrected in fetchmail :
    
    The sdump function in sdump.c in fetchmail 6.3.11, 6.3.12, and 6.3.13,
    when running in verbose mode on platforms for which char is signed,
    allows remote attackers to cause a denial of service (application
    crash) or possibly execute arbitrary code via an SSL X.509 certificate
    containing non-printable characters with the high bit set, which
    triggers a heap-based buffer overflow during escaping (CVE-2010-0562).
    
    This update provides fetchmail 6.3.14, which is not vulnerable to this
    issue."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.fetchmail.info/fetchmail-SA-2010-01.txt"
      );
      script_set_attribute(
        attribute:"solution", 
        value:
    "Update the affected fetchmail, fetchmail-daemon and / or fetchmailconf
    packages."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
      script_set_cvss_temporal_vector("CVSS2#E:ND/RL:OF/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"false");
      script_cwe_id(119);
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:fetchmail");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:fetchmail-daemon");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:mandriva:linux:fetchmailconf");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:mandriva:linux:2010.0");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2010/02/16");
      script_set_attribute(attribute:"plugin_publication_date", value:"2010/07/30");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2010-2019 Tenable Network Security, Inc.");
      script_family(english:"Mandriva Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/Mandrake/release", "Host/Mandrake/rpm-list");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("rpm.inc");
    
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    if (!get_kb_item("Host/Mandrake/release")) audit(AUDIT_OS_NOT, "Mandriva / Mandake Linux");
    if (!get_kb_item("Host/Mandrake/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if (cpu !~ "^(amd64|i[3-6]86|x86_64)$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Mandriva / Mandrake Linux", cpu);
    
    
    flag = 0;
    if (rpm_check(release:"MDK2010.0", reference:"fetchmail-6.3.14-0.1mdv2010.0", yank:"mdv")) flag++;
    if (rpm_check(release:"MDK2010.0", reference:"fetchmail-daemon-6.3.14-0.1mdv2010.0", yank:"mdv")) flag++;
    if (rpm_check(release:"MDK2010.0", reference:"fetchmailconf-6.3.14-0.1mdv2010.0", yank:"mdv")) flag++;
    
    
    if (flag)
    {
      if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
      else security_warning(0);
      exit(0);
    }
    else audit(AUDIT_HOST_NOT, "affected");
    
  • NASL familyFedora Local Security Checks
    NASL idFEDORA_2010-3800.NASL
    descriptionThe updated package fixes CVE-2010-0562. Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
    last seen2020-06-01
    modified2020-06-02
    plugin id47329
    published2010-07-01
    reporterThis script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/47329
    titleFedora 12 : fetchmail-6.3.11-4.fc12 (2010-3800)
    code
    #%NASL_MIN_LEVEL 80502
    #
    # (C) Tenable Network Security, Inc.
    #
    # The descriptive text and package checks in this plugin were  
    # extracted from Fedora Security Advisory 2010-3800.
    #
    
    include("compat.inc");
    
    if (description)
    {
      script_id(47329);
      script_version("1.11");
      script_cvs_date("Date: 2019/08/02 13:32:32");
    
      script_cve_id("CVE-2010-0562");
      script_bugtraq_id(38088);
      script_xref(name:"FEDORA", value:"2010-3800");
    
      script_name(english:"Fedora 12 : fetchmail-6.3.11-4.fc12 (2010-3800)");
      script_summary(english:"Checks rpm output for the updated package.");
    
      script_set_attribute(
        attribute:"synopsis", 
        value:"The remote Fedora host is missing a security update."
      );
      script_set_attribute(
        attribute:"description", 
        value:
    "The updated package fixes CVE-2010-0562.
    
    Note that Tenable Network Security has extracted the preceding
    description block directly from the Fedora security advisory. Tenable
    has attempted to automatically clean and format it as much as possible
    without introducing additional issues."
      );
      script_set_attribute(
        attribute:"see_also",
        value:"https://bugzilla.redhat.com/show_bug.cgi?id=561839"
      );
      # https://lists.fedoraproject.org/pipermail/package-announce/2010-March/036632.html
      script_set_attribute(
        attribute:"see_also",
        value:"http://www.nessus.org/u?965904e8"
      );
      script_set_attribute(
        attribute:"solution", 
        value:"Update the affected fetchmail package."
      );
      script_set_cvss_base_vector("CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P");
      script_set_cvss_temporal_vector("CVSS2#E:U/RL:OF/RC:C");
      script_set_attribute(attribute:"exploitability_ease", value:"No known exploits are available");
      script_set_attribute(attribute:"exploit_available", value:"false");
      script_cwe_id(119);
    
      script_set_attribute(attribute:"plugin_type", value:"local");
      script_set_attribute(attribute:"cpe", value:"p-cpe:/a:fedoraproject:fedora:fetchmail");
      script_set_attribute(attribute:"cpe", value:"cpe:/o:fedoraproject:fedora:12");
    
      script_set_attribute(attribute:"patch_publication_date", value:"2010/03/06");
      script_set_attribute(attribute:"plugin_publication_date", value:"2010/07/01");
      script_end_attributes();
    
      script_category(ACT_GATHER_INFO);
      script_copyright(english:"This script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.");
      script_family(english:"Fedora Local Security Checks");
    
      script_dependencies("ssh_get_info.nasl");
      script_require_keys("Host/local_checks_enabled", "Host/RedHat/release", "Host/RedHat/rpm-list");
    
      exit(0);
    }
    
    
    include("audit.inc");
    include("global_settings.inc");
    include("rpm.inc");
    
    if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
    release = get_kb_item("Host/RedHat/release");
    if (isnull(release) || "Fedora" >!< release) audit(AUDIT_OS_NOT, "Fedora");
    os_ver = eregmatch(pattern: "Fedora.*release ([0-9]+)", string:release);
    if (isnull(os_ver)) audit(AUDIT_UNKNOWN_APP_VER, "Fedora");
    os_ver = os_ver[1];
    if (! ereg(pattern:"^12([^0-9]|$)", string:os_ver)) audit(AUDIT_OS_NOT, "Fedora 12.x", "Fedora " + os_ver);
    
    if (!get_kb_item("Host/RedHat/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
    
    cpu = get_kb_item("Host/cpu");
    if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
    if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$") audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "Fedora", cpu);
    
    flag = 0;
    if (rpm_check(release:"FC12", reference:"fetchmail-6.3.11-4.fc12")) flag++;
    
    
    if (flag)
    {
      if (report_verbosity > 0) security_warning(port:0, extra:rpm_report_get());
      else security_warning(0);
      exit(0);
    }
    else
    {
      tested = pkg_tests_get();
      if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
      else audit(AUDIT_PACKAGE_NOT_INSTALLED, "fetchmail");
    }
    
  • NASL familyGentoo Local Security Checks
    NASL idGENTOO_GLSA-201006-12.NASL
    descriptionThe remote host is affected by the vulnerability described in GLSA-201006-12 (Fetchmail: Multiple vulnerabilities) Multiple vulnerabilities have been reported in Fetchmail: The sdump() function might trigger a heap-based buffer overflow during the escaping of non-printable characters with the high bit set from an X.509 certificate (CVE-2010-0562). The vendor reported that Fetchmail does not properly handle Common Name (CN) fields in X.509 certificates that contain an ASCII NUL character. Specifically, the processing of such fields is stopped at the first occurrence of a NUL character. This type of vulnerability was recently discovered by Dan Kaminsky and Moxie Marlinspike (CVE-2009-2666). Impact : A remote attacker could entice a user to connect with Fetchmail to a specially crafted SSL-enabled server in verbose mode, possibly resulting in the execution of arbitrary code with the privileges of the user running the application. NOTE: The issue is only existent on platforms on which char is signed. Furthermore, a remote attacker might employ a specially crafted X.509 certificate, containing a NUL character in the Common Name field to conduct man-in-the-middle attacks on SSL connections made using Fetchmail. Workaround : There is no known workaround at this time.
    last seen2020-06-01
    modified2020-06-02
    plugin id46779
    published2010-06-02
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/46779
    titleGLSA-201006-12 : Fetchmail: Multiple vulnerabilities
  • NASL familyFreeBSD Local Security Checks
    NASL idFREEBSD_PKG_2A6A966F177411DFB5C10026189BACA3.NASL
    descriptionMatthias Andree reports : In verbose mode, fetchmail prints X.509 certificate subject and issuer information to the user, and counts and allocates a malloc() buffer for that purpose. If the material to be displayed contains characters with high bit set and the platform treats the
    last seen2020-06-01
    modified2020-06-02
    plugin id44600
    published2010-02-15
    reporterThis script is Copyright (C) 2010-2019 and is owned by Tenable, Inc. or an Affiliate thereof.
    sourcehttps://www.tenable.com/plugins/nessus/44600
    titleFreeBSD : fetchmail -- heap overflow on verbose X.509 display (2a6a966f-1774-11df-b5c1-0026189baca3)
  • NASL familySuSE Local Security Checks
    NASL idSUSE_11_2_FETCHMAIL-100216.NASL
    descriptionThis update fixes a heap-based overflow in fetchmail
    last seen2020-06-01
    modified2020-06-02
    plugin id44667
    published2010-02-19
    reporterThis script is Copyright (C) 2010-2019 Tenable Network Security, Inc.
    sourcehttps://www.tenable.com/plugins/nessus/44667
    titleopenSUSE Security Update : fetchmail (fetchmail-1996)

Statements

contributorTomas Hoger
lastmodified2010-02-09
organizationRed Hat
statementNot vulnerable. This issue did not affect the versions of fetchmail as shipped with Red Hat Enterprise Linux 3, 4, or 5.